scan.c revision 37cabc81640ddba28a2aa7f0d1286a1012eae248
1/* 2 * scan.c - support for transforming the ACPI namespace into individual objects 3 */ 4 5#include <linux/module.h> 6#include <linux/init.h> 7#include <linux/kernel.h> 8#include <linux/acpi.h> 9 10#include <acpi/acpi_drivers.h> 11#include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */ 12 13#define _COMPONENT ACPI_BUS_COMPONENT 14ACPI_MODULE_NAME("scan") 15#define STRUCT_TO_INT(s) (*((int*)&s)) 16extern struct acpi_device *acpi_root; 17 18#define ACPI_BUS_CLASS "system_bus" 19#define ACPI_BUS_HID "ACPI_BUS" 20#define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver" 21#define ACPI_BUS_DEVICE_NAME "System Bus" 22 23static LIST_HEAD(acpi_device_list); 24DEFINE_SPINLOCK(acpi_device_lock); 25LIST_HEAD(acpi_wakeup_device_list); 26 27 28static void acpi_device_release(struct kobject *kobj) 29{ 30 struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj); 31 kfree(dev->pnp.cid_list); 32 kfree(dev); 33} 34 35struct acpi_device_attribute { 36 struct attribute attr; 37 ssize_t(*show) (struct acpi_device *, char *); 38 ssize_t(*store) (struct acpi_device *, const char *, size_t); 39}; 40 41typedef void acpi_device_sysfs_files(struct kobject *, 42 const struct attribute *); 43 44static void setup_sys_fs_device_files(struct acpi_device *dev, 45 acpi_device_sysfs_files * func); 46 47#define create_sysfs_device_files(dev) \ 48 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file) 49#define remove_sysfs_device_files(dev) \ 50 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file) 51 52#define to_acpi_device(n) container_of(n, struct acpi_device, kobj) 53#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr); 54 55static ssize_t acpi_device_attr_show(struct kobject *kobj, 56 struct attribute *attr, char *buf) 57{ 58 struct acpi_device *device = to_acpi_device(kobj); 59 struct acpi_device_attribute *attribute = to_handle_attr(attr); 60 return attribute->show ? attribute->show(device, buf) : -EIO; 61} 62static ssize_t acpi_device_attr_store(struct kobject *kobj, 63 struct attribute *attr, const char *buf, 64 size_t len) 65{ 66 struct acpi_device *device = to_acpi_device(kobj); 67 struct acpi_device_attribute *attribute = to_handle_attr(attr); 68 return attribute->store ? attribute->store(device, buf, len) : -EIO; 69} 70 71static struct sysfs_ops acpi_device_sysfs_ops = { 72 .show = acpi_device_attr_show, 73 .store = acpi_device_attr_store, 74}; 75 76static struct kobj_type ktype_acpi_ns = { 77 .sysfs_ops = &acpi_device_sysfs_ops, 78 .release = acpi_device_release, 79}; 80 81static int namespace_uevent(struct kset *kset, struct kobject *kobj, 82 char **envp, int num_envp, char *buffer, 83 int buffer_size) 84{ 85 struct acpi_device *dev = to_acpi_device(kobj); 86 int i = 0; 87 int len = 0; 88 89 if (!dev->driver) 90 return 0; 91 92 if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, 93 "PHYSDEVDRIVER=%s", dev->driver->name)) 94 return -ENOMEM; 95 96 envp[i] = NULL; 97 98 return 0; 99} 100 101static struct kset_uevent_ops namespace_uevent_ops = { 102 .uevent = &namespace_uevent, 103}; 104 105static struct kset acpi_namespace_kset = { 106 .kobj = { 107 .name = "namespace", 108 }, 109 .subsys = &acpi_subsys, 110 .ktype = &ktype_acpi_ns, 111 .uevent_ops = &namespace_uevent_ops, 112}; 113 114static void acpi_device_register(struct acpi_device *device, 115 struct acpi_device *parent) 116{ 117 int err; 118 119 /* 120 * Linkage 121 * ------- 122 * Link this device to its parent and siblings. 123 */ 124 INIT_LIST_HEAD(&device->children); 125 INIT_LIST_HEAD(&device->node); 126 INIT_LIST_HEAD(&device->g_list); 127 INIT_LIST_HEAD(&device->wakeup_list); 128 129 spin_lock(&acpi_device_lock); 130 if (device->parent) { 131 list_add_tail(&device->node, &device->parent->children); 132 list_add_tail(&device->g_list, &device->parent->g_list); 133 } else 134 list_add_tail(&device->g_list, &acpi_device_list); 135 if (device->wakeup.flags.valid) 136 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); 137 spin_unlock(&acpi_device_lock); 138 139 strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN); 140 if (parent) 141 device->kobj.parent = &parent->kobj; 142 device->kobj.ktype = &ktype_acpi_ns; 143 device->kobj.kset = &acpi_namespace_kset; 144 err = kobject_register(&device->kobj); 145 if (err < 0) 146 printk(KERN_WARNING "%s: kobject_register error: %d\n", 147 __FUNCTION__, err); 148 create_sysfs_device_files(device); 149} 150 151static void acpi_device_unregister(struct acpi_device *device, int type) 152{ 153 spin_lock(&acpi_device_lock); 154 if (device->parent) { 155 list_del(&device->node); 156 list_del(&device->g_list); 157 } else 158 list_del(&device->g_list); 159 160 list_del(&device->wakeup_list); 161 162 spin_unlock(&acpi_device_lock); 163 164 acpi_detach_data(device->handle, acpi_bus_data_handler); 165 remove_sysfs_device_files(device); 166 kobject_unregister(&device->kobj); 167} 168 169void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) 170{ 171 172 /* TBD */ 173 174 return; 175} 176 177static int acpi_bus_get_power_flags(struct acpi_device *device) 178{ 179 acpi_status status = 0; 180 acpi_handle handle = NULL; 181 u32 i = 0; 182 183 184 /* 185 * Power Management Flags 186 */ 187 status = acpi_get_handle(device->handle, "_PSC", &handle); 188 if (ACPI_SUCCESS(status)) 189 device->power.flags.explicit_get = 1; 190 status = acpi_get_handle(device->handle, "_IRC", &handle); 191 if (ACPI_SUCCESS(status)) 192 device->power.flags.inrush_current = 1; 193 194 /* 195 * Enumerate supported power management states 196 */ 197 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { 198 struct acpi_device_power_state *ps = &device->power.states[i]; 199 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; 200 201 /* Evaluate "_PRx" to se if power resources are referenced */ 202 acpi_evaluate_reference(device->handle, object_name, NULL, 203 &ps->resources); 204 if (ps->resources.count) { 205 device->power.flags.power_resources = 1; 206 ps->flags.valid = 1; 207 } 208 209 /* Evaluate "_PSx" to see if we can do explicit sets */ 210 object_name[2] = 'S'; 211 status = acpi_get_handle(device->handle, object_name, &handle); 212 if (ACPI_SUCCESS(status)) { 213 ps->flags.explicit_set = 1; 214 ps->flags.valid = 1; 215 } 216 217 /* State is valid if we have some power control */ 218 if (ps->resources.count || ps->flags.explicit_set) 219 ps->flags.valid = 1; 220 221 ps->power = -1; /* Unknown - driver assigned */ 222 ps->latency = -1; /* Unknown - driver assigned */ 223 } 224 225 /* Set defaults for D0 and D3 states (always valid) */ 226 device->power.states[ACPI_STATE_D0].flags.valid = 1; 227 device->power.states[ACPI_STATE_D0].power = 100; 228 device->power.states[ACPI_STATE_D3].flags.valid = 1; 229 device->power.states[ACPI_STATE_D3].power = 0; 230 231 /* TBD: System wake support and resource requirements. */ 232 233 device->power.state = ACPI_STATE_UNKNOWN; 234 235 return 0; 236} 237 238int acpi_match_ids(struct acpi_device *device, char *ids) 239{ 240 if (device->flags.hardware_id) 241 if (strstr(ids, device->pnp.hardware_id)) 242 return 0; 243 244 if (device->flags.compatible_ids) { 245 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; 246 int i; 247 248 /* compare multiple _CID entries against driver ids */ 249 for (i = 0; i < cid_list->count; i++) { 250 if (strstr(ids, cid_list->id[i].value)) 251 return 0; 252 } 253 } 254 return -ENOENT; 255} 256 257static acpi_status 258acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, 259 union acpi_object *package) 260{ 261 int i = 0; 262 union acpi_object *element = NULL; 263 264 if (!device || !package || (package->package.count < 2)) 265 return AE_BAD_PARAMETER; 266 267 element = &(package->package.elements[0]); 268 if (!element) 269 return AE_BAD_PARAMETER; 270 if (element->type == ACPI_TYPE_PACKAGE) { 271 if ((element->package.count < 2) || 272 (element->package.elements[0].type != 273 ACPI_TYPE_LOCAL_REFERENCE) 274 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) 275 return AE_BAD_DATA; 276 device->wakeup.gpe_device = 277 element->package.elements[0].reference.handle; 278 device->wakeup.gpe_number = 279 (u32) element->package.elements[1].integer.value; 280 } else if (element->type == ACPI_TYPE_INTEGER) { 281 device->wakeup.gpe_number = element->integer.value; 282 } else 283 return AE_BAD_DATA; 284 285 element = &(package->package.elements[1]); 286 if (element->type != ACPI_TYPE_INTEGER) { 287 return AE_BAD_DATA; 288 } 289 device->wakeup.sleep_state = element->integer.value; 290 291 if ((package->package.count - 2) > ACPI_MAX_HANDLES) { 292 return AE_NO_MEMORY; 293 } 294 device->wakeup.resources.count = package->package.count - 2; 295 for (i = 0; i < device->wakeup.resources.count; i++) { 296 element = &(package->package.elements[i + 2]); 297 if (element->type != ACPI_TYPE_ANY) { 298 return AE_BAD_DATA; 299 } 300 301 device->wakeup.resources.handles[i] = element->reference.handle; 302 } 303 304 return AE_OK; 305} 306 307static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 308{ 309 acpi_status status = 0; 310 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 311 union acpi_object *package = NULL; 312 313 314 /* _PRW */ 315 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); 316 if (ACPI_FAILURE(status)) { 317 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); 318 goto end; 319 } 320 321 package = (union acpi_object *)buffer.pointer; 322 status = acpi_bus_extract_wakeup_device_power_package(device, package); 323 if (ACPI_FAILURE(status)) { 324 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); 325 goto end; 326 } 327 328 kfree(buffer.pointer); 329 330 device->wakeup.flags.valid = 1; 331 /* Power button, Lid switch always enable wakeup */ 332 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E")) 333 device->wakeup.flags.run_wake = 1; 334 335 end: 336 if (ACPI_FAILURE(status)) 337 device->flags.wake_capable = 0; 338 return 0; 339} 340 341/* -------------------------------------------------------------------------- 342 ACPI sysfs device file support 343 -------------------------------------------------------------------------- */ 344static ssize_t acpi_eject_store(struct acpi_device *device, 345 const char *buf, size_t count); 346 347#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \ 348static struct acpi_device_attribute acpi_device_attr_##_name = \ 349 __ATTR(_name, _mode, _show, _store) 350 351ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); 352 353/** 354 * setup_sys_fs_device_files - sets up the device files under device namespace 355 * @dev: acpi_device object 356 * @func: function pointer to create or destroy the device file 357 */ 358static void 359setup_sys_fs_device_files(struct acpi_device *dev, 360 acpi_device_sysfs_files * func) 361{ 362 acpi_status status; 363 acpi_handle temp = NULL; 364 365 /* 366 * If device has _EJ0, 'eject' file is created that is used to trigger 367 * hot-removal function from userland. 368 */ 369 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 370 if (ACPI_SUCCESS(status)) 371 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr); 372} 373 374static int acpi_eject_operation(acpi_handle handle, int lockable) 375{ 376 struct acpi_object_list arg_list; 377 union acpi_object arg; 378 acpi_status status = AE_OK; 379 380 /* 381 * TBD: evaluate _PS3? 382 */ 383 384 if (lockable) { 385 arg_list.count = 1; 386 arg_list.pointer = &arg; 387 arg.type = ACPI_TYPE_INTEGER; 388 arg.integer.value = 0; 389 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); 390 } 391 392 arg_list.count = 1; 393 arg_list.pointer = &arg; 394 arg.type = ACPI_TYPE_INTEGER; 395 arg.integer.value = 1; 396 397 /* 398 * TBD: _EJD support. 399 */ 400 401 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); 402 if (ACPI_FAILURE(status)) { 403 return (-ENODEV); 404 } 405 406 return (0); 407} 408 409static ssize_t 410acpi_eject_store(struct acpi_device *device, const char *buf, size_t count) 411{ 412 int result; 413 int ret = count; 414 int islockable; 415 acpi_status status; 416 acpi_handle handle; 417 acpi_object_type type = 0; 418 419 if ((!count) || (buf[0] != '1')) { 420 return -EINVAL; 421 } 422#ifndef FORCE_EJECT 423 if (device->driver == NULL) { 424 ret = -ENODEV; 425 goto err; 426 } 427#endif 428 status = acpi_get_type(device->handle, &type); 429 if (ACPI_FAILURE(status) || (!device->flags.ejectable)) { 430 ret = -ENODEV; 431 goto err; 432 } 433 434 islockable = device->flags.lockable; 435 handle = device->handle; 436 437 result = acpi_bus_trim(device, 1); 438 439 if (!result) 440 result = acpi_eject_operation(handle, islockable); 441 442 if (result) { 443 ret = -EBUSY; 444 } 445 err: 446 return ret; 447} 448 449/* -------------------------------------------------------------------------- 450 Performance Management 451 -------------------------------------------------------------------------- */ 452 453static int acpi_bus_get_perf_flags(struct acpi_device *device) 454{ 455 device->performance.state = ACPI_STATE_UNKNOWN; 456 return 0; 457} 458 459/* -------------------------------------------------------------------------- 460 Driver Management 461 -------------------------------------------------------------------------- */ 462 463static LIST_HEAD(acpi_bus_drivers); 464 465/** 466 * acpi_bus_match - match device IDs to driver's supported IDs 467 * @device: the device that we are trying to match to a driver 468 * @driver: driver whose device id table is being checked 469 * 470 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it 471 * matches the specified driver's criteria. 472 */ 473static int 474acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver) 475{ 476 if (driver && driver->ops.match) 477 return driver->ops.match(device, driver); 478 return acpi_match_ids(device, driver->ids); 479} 480 481/** 482 * acpi_bus_driver_init - add a device to a driver 483 * @device: the device to add and initialize 484 * @driver: driver for the device 485 * 486 * Used to initialize a device via its device driver. Called whenever a 487 * driver is bound to a device. Invokes the driver's add() and start() ops. 488 */ 489static int 490acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) 491{ 492 int result = 0; 493 494 495 if (!device || !driver) 496 return -EINVAL; 497 498 if (!driver->ops.add) 499 return -ENOSYS; 500 501 result = driver->ops.add(device); 502 if (result) { 503 device->driver = NULL; 504 acpi_driver_data(device) = NULL; 505 return result; 506 } 507 508 device->driver = driver; 509 510 /* 511 * TBD - Configuration Management: Assign resources to device based 512 * upon possible configuration and currently allocated resources. 513 */ 514 515 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 516 "Driver successfully bound to device\n")); 517 return 0; 518} 519 520static int acpi_start_single_object(struct acpi_device *device) 521{ 522 int result = 0; 523 struct acpi_driver *driver; 524 525 526 if (!(driver = device->driver)) 527 return 0; 528 529 if (driver->ops.start) { 530 result = driver->ops.start(device); 531 if (result && driver->ops.remove) 532 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); 533 } 534 535 return result; 536} 537 538static void acpi_driver_attach(struct acpi_driver *drv) 539{ 540 struct list_head *node, *next; 541 542 543 spin_lock(&acpi_device_lock); 544 list_for_each_safe(node, next, &acpi_device_list) { 545 struct acpi_device *dev = 546 container_of(node, struct acpi_device, g_list); 547 548 if (dev->driver || !dev->status.present) 549 continue; 550 spin_unlock(&acpi_device_lock); 551 552 if (!acpi_bus_match(dev, drv)) { 553 if (!acpi_bus_driver_init(dev, drv)) { 554 acpi_start_single_object(dev); 555 atomic_inc(&drv->references); 556 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 557 "Found driver [%s] for device [%s]\n", 558 drv->name, dev->pnp.bus_id)); 559 } 560 } 561 spin_lock(&acpi_device_lock); 562 } 563 spin_unlock(&acpi_device_lock); 564} 565 566static void acpi_driver_detach(struct acpi_driver *drv) 567{ 568 struct list_head *node, *next; 569 570 571 spin_lock(&acpi_device_lock); 572 list_for_each_safe(node, next, &acpi_device_list) { 573 struct acpi_device *dev = 574 container_of(node, struct acpi_device, g_list); 575 576 if (dev->driver == drv) { 577 spin_unlock(&acpi_device_lock); 578 if (drv->ops.remove) 579 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL); 580 spin_lock(&acpi_device_lock); 581 dev->driver = NULL; 582 dev->driver_data = NULL; 583 atomic_dec(&drv->references); 584 } 585 } 586 spin_unlock(&acpi_device_lock); 587} 588 589/** 590 * acpi_bus_register_driver - register a driver with the ACPI bus 591 * @driver: driver being registered 592 * 593 * Registers a driver with the ACPI bus. Searches the namespace for all 594 * devices that match the driver's criteria and binds. Returns zero for 595 * success or a negative error status for failure. 596 */ 597int acpi_bus_register_driver(struct acpi_driver *driver) 598{ 599 600 if (acpi_disabled) 601 return -ENODEV; 602 603 spin_lock(&acpi_device_lock); 604 list_add_tail(&driver->node, &acpi_bus_drivers); 605 spin_unlock(&acpi_device_lock); 606 acpi_driver_attach(driver); 607 608 return 0; 609} 610 611EXPORT_SYMBOL(acpi_bus_register_driver); 612 613/** 614 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus 615 * @driver: driver to unregister 616 * 617 * Unregisters a driver with the ACPI bus. Searches the namespace for all 618 * devices that match the driver's criteria and unbinds. 619 */ 620void acpi_bus_unregister_driver(struct acpi_driver *driver) 621{ 622 acpi_driver_detach(driver); 623 624 if (!atomic_read(&driver->references)) { 625 spin_lock(&acpi_device_lock); 626 list_del_init(&driver->node); 627 spin_unlock(&acpi_device_lock); 628 } 629 return; 630} 631 632EXPORT_SYMBOL(acpi_bus_unregister_driver); 633 634/** 635 * acpi_bus_find_driver - check if there is a driver installed for the device 636 * @device: device that we are trying to find a supporting driver for 637 * 638 * Parses the list of registered drivers looking for a driver applicable for 639 * the specified device. 640 */ 641static int acpi_bus_find_driver(struct acpi_device *device) 642{ 643 int result = 0; 644 struct list_head *node, *next; 645 646 647 spin_lock(&acpi_device_lock); 648 list_for_each_safe(node, next, &acpi_bus_drivers) { 649 struct acpi_driver *driver = 650 container_of(node, struct acpi_driver, node); 651 652 atomic_inc(&driver->references); 653 spin_unlock(&acpi_device_lock); 654 if (!acpi_bus_match(device, driver)) { 655 result = acpi_bus_driver_init(device, driver); 656 if (!result) 657 goto Done; 658 } 659 atomic_dec(&driver->references); 660 spin_lock(&acpi_device_lock); 661 } 662 spin_unlock(&acpi_device_lock); 663 664 Done: 665 return result; 666} 667 668/* -------------------------------------------------------------------------- 669 Device Enumeration 670 -------------------------------------------------------------------------- */ 671 672acpi_status 673acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) 674{ 675 acpi_status status; 676 acpi_handle tmp; 677 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 678 union acpi_object *obj; 679 680 status = acpi_get_handle(handle, "_EJD", &tmp); 681 if (ACPI_FAILURE(status)) 682 return status; 683 684 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); 685 if (ACPI_SUCCESS(status)) { 686 obj = buffer.pointer; 687 status = acpi_get_handle(NULL, obj->string.pointer, ejd); 688 kfree(buffer.pointer); 689 } 690 return status; 691} 692EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); 693 694 695static int acpi_bus_get_flags(struct acpi_device *device) 696{ 697 acpi_status status = AE_OK; 698 acpi_handle temp = NULL; 699 700 701 /* Presence of _STA indicates 'dynamic_status' */ 702 status = acpi_get_handle(device->handle, "_STA", &temp); 703 if (ACPI_SUCCESS(status)) 704 device->flags.dynamic_status = 1; 705 706 /* Presence of _CID indicates 'compatible_ids' */ 707 status = acpi_get_handle(device->handle, "_CID", &temp); 708 if (ACPI_SUCCESS(status)) 709 device->flags.compatible_ids = 1; 710 711 /* Presence of _RMV indicates 'removable' */ 712 status = acpi_get_handle(device->handle, "_RMV", &temp); 713 if (ACPI_SUCCESS(status)) 714 device->flags.removable = 1; 715 716 /* Presence of _EJD|_EJ0 indicates 'ejectable' */ 717 status = acpi_get_handle(device->handle, "_EJD", &temp); 718 if (ACPI_SUCCESS(status)) 719 device->flags.ejectable = 1; 720 else { 721 status = acpi_get_handle(device->handle, "_EJ0", &temp); 722 if (ACPI_SUCCESS(status)) 723 device->flags.ejectable = 1; 724 } 725 726 /* Presence of _LCK indicates 'lockable' */ 727 status = acpi_get_handle(device->handle, "_LCK", &temp); 728 if (ACPI_SUCCESS(status)) 729 device->flags.lockable = 1; 730 731 /* Presence of _PS0|_PR0 indicates 'power manageable' */ 732 status = acpi_get_handle(device->handle, "_PS0", &temp); 733 if (ACPI_FAILURE(status)) 734 status = acpi_get_handle(device->handle, "_PR0", &temp); 735 if (ACPI_SUCCESS(status)) 736 device->flags.power_manageable = 1; 737 738 /* Presence of _PRW indicates wake capable */ 739 status = acpi_get_handle(device->handle, "_PRW", &temp); 740 if (ACPI_SUCCESS(status)) 741 device->flags.wake_capable = 1; 742 743 /* TBD: Peformance management */ 744 745 return 0; 746} 747 748static void acpi_device_get_busid(struct acpi_device *device, 749 acpi_handle handle, int type) 750{ 751 char bus_id[5] = { '?', 0 }; 752 struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; 753 int i = 0; 754 755 /* 756 * Bus ID 757 * ------ 758 * The device's Bus ID is simply the object name. 759 * TBD: Shouldn't this value be unique (within the ACPI namespace)? 760 */ 761 switch (type) { 762 case ACPI_BUS_TYPE_SYSTEM: 763 strcpy(device->pnp.bus_id, "ACPI"); 764 break; 765 case ACPI_BUS_TYPE_POWER_BUTTON: 766 strcpy(device->pnp.bus_id, "PWRF"); 767 break; 768 case ACPI_BUS_TYPE_SLEEP_BUTTON: 769 strcpy(device->pnp.bus_id, "SLPF"); 770 break; 771 default: 772 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); 773 /* Clean up trailing underscores (if any) */ 774 for (i = 3; i > 1; i--) { 775 if (bus_id[i] == '_') 776 bus_id[i] = '\0'; 777 else 778 break; 779 } 780 strcpy(device->pnp.bus_id, bus_id); 781 break; 782 } 783} 784 785static void acpi_device_set_id(struct acpi_device *device, 786 struct acpi_device *parent, acpi_handle handle, 787 int type) 788{ 789 struct acpi_device_info *info; 790 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 791 char *hid = NULL; 792 char *uid = NULL; 793 struct acpi_compatible_id_list *cid_list = NULL; 794 acpi_status status; 795 796 switch (type) { 797 case ACPI_BUS_TYPE_DEVICE: 798 status = acpi_get_object_info(handle, &buffer); 799 if (ACPI_FAILURE(status)) { 800 printk("%s: Error reading device info\n", __FUNCTION__); 801 return; 802 } 803 804 info = buffer.pointer; 805 if (info->valid & ACPI_VALID_HID) 806 hid = info->hardware_id.value; 807 if (info->valid & ACPI_VALID_UID) 808 uid = info->unique_id.value; 809 if (info->valid & ACPI_VALID_CID) 810 cid_list = &info->compatibility_id; 811 if (info->valid & ACPI_VALID_ADR) { 812 device->pnp.bus_address = info->address; 813 device->flags.bus_address = 1; 814 } 815 break; 816 case ACPI_BUS_TYPE_POWER: 817 hid = ACPI_POWER_HID; 818 break; 819 case ACPI_BUS_TYPE_PROCESSOR: 820 hid = ACPI_PROCESSOR_HID; 821 break; 822 case ACPI_BUS_TYPE_SYSTEM: 823 hid = ACPI_SYSTEM_HID; 824 break; 825 case ACPI_BUS_TYPE_THERMAL: 826 hid = ACPI_THERMAL_HID; 827 break; 828 case ACPI_BUS_TYPE_POWER_BUTTON: 829 hid = ACPI_BUTTON_HID_POWERF; 830 break; 831 case ACPI_BUS_TYPE_SLEEP_BUTTON: 832 hid = ACPI_BUTTON_HID_SLEEPF; 833 break; 834 } 835 836 /* 837 * \_SB 838 * ---- 839 * Fix for the system root bus device -- the only root-level device. 840 */ 841 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { 842 hid = ACPI_BUS_HID; 843 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); 844 strcpy(device->pnp.device_class, ACPI_BUS_CLASS); 845 } 846 847 if (hid) { 848 strcpy(device->pnp.hardware_id, hid); 849 device->flags.hardware_id = 1; 850 } 851 if (uid) { 852 strcpy(device->pnp.unique_id, uid); 853 device->flags.unique_id = 1; 854 } 855 if (cid_list) { 856 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL); 857 if (device->pnp.cid_list) 858 memcpy(device->pnp.cid_list, cid_list, cid_list->size); 859 else 860 printk(KERN_ERR "Memory allocation error\n"); 861 } 862 863 kfree(buffer.pointer); 864} 865 866static int acpi_device_set_context(struct acpi_device *device, int type) 867{ 868 acpi_status status = AE_OK; 869 int result = 0; 870 /* 871 * Context 872 * ------- 873 * Attach this 'struct acpi_device' to the ACPI object. This makes 874 * resolutions from handle->device very efficient. Note that we need 875 * to be careful with fixed-feature devices as they all attach to the 876 * root object. 877 */ 878 if (type != ACPI_BUS_TYPE_POWER_BUTTON && 879 type != ACPI_BUS_TYPE_SLEEP_BUTTON) { 880 status = acpi_attach_data(device->handle, 881 acpi_bus_data_handler, device); 882 883 if (ACPI_FAILURE(status)) { 884 printk("Error attaching device data\n"); 885 result = -ENODEV; 886 } 887 } 888 return result; 889} 890 891static void acpi_device_get_debug_info(struct acpi_device *device, 892 acpi_handle handle, int type) 893{ 894#ifdef ACPI_DEBUG_OUTPUT 895 char *type_string = NULL; 896 char name[80] = { '?', '\0' }; 897 struct acpi_buffer buffer = { sizeof(name), name }; 898 899 switch (type) { 900 case ACPI_BUS_TYPE_DEVICE: 901 type_string = "Device"; 902 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 903 break; 904 case ACPI_BUS_TYPE_POWER: 905 type_string = "Power Resource"; 906 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 907 break; 908 case ACPI_BUS_TYPE_PROCESSOR: 909 type_string = "Processor"; 910 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 911 break; 912 case ACPI_BUS_TYPE_SYSTEM: 913 type_string = "System"; 914 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 915 break; 916 case ACPI_BUS_TYPE_THERMAL: 917 type_string = "Thermal Zone"; 918 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 919 break; 920 case ACPI_BUS_TYPE_POWER_BUTTON: 921 type_string = "Power Button"; 922 sprintf(name, "PWRB"); 923 break; 924 case ACPI_BUS_TYPE_SLEEP_BUTTON: 925 type_string = "Sleep Button"; 926 sprintf(name, "SLPB"); 927 break; 928 } 929 930 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle); 931#endif /* ACPI_DEBUG_OUTPUT */ 932} 933 934static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) 935{ 936 int result = 0; 937 struct acpi_driver *driver; 938 939 940 if (!dev) 941 return -EINVAL; 942 943 driver = dev->driver; 944 945 if ((driver) && (driver->ops.remove)) { 946 947 if (driver->ops.stop) { 948 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT); 949 if (result) 950 return result; 951 } 952 953 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT); 954 if (result) { 955 return result; 956 } 957 958 atomic_dec(&dev->driver->references); 959 dev->driver = NULL; 960 acpi_driver_data(dev) = NULL; 961 } 962 963 if (!rmdevice) 964 return 0; 965 966 if (dev->flags.bus_address) { 967 if ((dev->parent) && (dev->parent->ops.unbind)) 968 dev->parent->ops.unbind(dev); 969 } 970 971 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); 972 973 return 0; 974} 975 976static int 977acpi_add_single_object(struct acpi_device **child, 978 struct acpi_device *parent, acpi_handle handle, int type) 979{ 980 int result = 0; 981 struct acpi_device *device = NULL; 982 983 984 if (!child) 985 return -EINVAL; 986 987 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); 988 if (!device) { 989 printk(KERN_ERR PREFIX "Memory allocation error\n"); 990 return -ENOMEM; 991 } 992 993 device->handle = handle; 994 device->parent = parent; 995 996 acpi_device_get_busid(device, handle, type); 997 998 /* 999 * Flags 1000 * ----- 1001 * Get prior to calling acpi_bus_get_status() so we know whether 1002 * or not _STA is present. Note that we only look for object 1003 * handles -- cannot evaluate objects until we know the device is 1004 * present and properly initialized. 1005 */ 1006 result = acpi_bus_get_flags(device); 1007 if (result) 1008 goto end; 1009 1010 /* 1011 * Status 1012 * ------ 1013 * See if the device is present. We always assume that non-Device 1014 * and non-Processor objects (e.g. thermal zones, power resources, 1015 * etc.) are present, functioning, etc. (at least when parent object 1016 * is present). Note that _STA has a different meaning for some 1017 * objects (e.g. power resources) so we need to be careful how we use 1018 * it. 1019 */ 1020 switch (type) { 1021 case ACPI_BUS_TYPE_PROCESSOR: 1022 case ACPI_BUS_TYPE_DEVICE: 1023 result = acpi_bus_get_status(device); 1024 if (ACPI_FAILURE(result) || !device->status.present) { 1025 result = -ENOENT; 1026 goto end; 1027 } 1028 break; 1029 default: 1030 STRUCT_TO_INT(device->status) = 0x0F; 1031 break; 1032 } 1033 1034 /* 1035 * Initialize Device 1036 * ----------------- 1037 * TBD: Synch with Core's enumeration/initialization process. 1038 */ 1039 1040 /* 1041 * Hardware ID, Unique ID, & Bus Address 1042 * ------------------------------------- 1043 */ 1044 acpi_device_set_id(device, parent, handle, type); 1045 1046 /* 1047 * Power Management 1048 * ---------------- 1049 */ 1050 if (device->flags.power_manageable) { 1051 result = acpi_bus_get_power_flags(device); 1052 if (result) 1053 goto end; 1054 } 1055 1056 /* 1057 * Wakeup device management 1058 *----------------------- 1059 */ 1060 if (device->flags.wake_capable) { 1061 result = acpi_bus_get_wakeup_device_flags(device); 1062 if (result) 1063 goto end; 1064 } 1065 1066 /* 1067 * Performance Management 1068 * ---------------------- 1069 */ 1070 if (device->flags.performance_manageable) { 1071 result = acpi_bus_get_perf_flags(device); 1072 if (result) 1073 goto end; 1074 } 1075 1076 if ((result = acpi_device_set_context(device, type))) 1077 goto end; 1078 1079 acpi_device_get_debug_info(device, handle, type); 1080 1081 acpi_device_register(device, parent); 1082 1083 /* 1084 * Bind _ADR-Based Devices 1085 * ----------------------- 1086 * If there's a a bus address (_ADR) then we utilize the parent's 1087 * 'bind' function (if exists) to bind the ACPI- and natively- 1088 * enumerated device representations. 1089 */ 1090 if (device->flags.bus_address) { 1091 if (device->parent && device->parent->ops.bind) 1092 device->parent->ops.bind(device); 1093 } 1094 1095 /* 1096 * Locate & Attach Driver 1097 * ---------------------- 1098 * If there's a hardware id (_HID) or compatible ids (_CID) we check 1099 * to see if there's a driver installed for this kind of device. Note 1100 * that drivers can install before or after a device is enumerated. 1101 * 1102 * TBD: Assumes LDM provides driver hot-plug capability. 1103 */ 1104 acpi_bus_find_driver(device); 1105 1106 end: 1107 if (!result) 1108 *child = device; 1109 else { 1110 kfree(device->pnp.cid_list); 1111 kfree(device); 1112 } 1113 1114 return result; 1115} 1116 1117static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) 1118{ 1119 acpi_status status = AE_OK; 1120 struct acpi_device *parent = NULL; 1121 struct acpi_device *child = NULL; 1122 acpi_handle phandle = NULL; 1123 acpi_handle chandle = NULL; 1124 acpi_object_type type = 0; 1125 u32 level = 1; 1126 1127 1128 if (!start) 1129 return -EINVAL; 1130 1131 parent = start; 1132 phandle = start->handle; 1133 1134 /* 1135 * Parse through the ACPI namespace, identify all 'devices', and 1136 * create a new 'struct acpi_device' for each. 1137 */ 1138 while ((level > 0) && parent) { 1139 1140 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1141 chandle, &chandle); 1142 1143 /* 1144 * If this scope is exhausted then move our way back up. 1145 */ 1146 if (ACPI_FAILURE(status)) { 1147 level--; 1148 chandle = phandle; 1149 acpi_get_parent(phandle, &phandle); 1150 if (parent->parent) 1151 parent = parent->parent; 1152 continue; 1153 } 1154 1155 status = acpi_get_type(chandle, &type); 1156 if (ACPI_FAILURE(status)) 1157 continue; 1158 1159 /* 1160 * If this is a scope object then parse it (depth-first). 1161 */ 1162 if (type == ACPI_TYPE_LOCAL_SCOPE) { 1163 level++; 1164 phandle = chandle; 1165 chandle = NULL; 1166 continue; 1167 } 1168 1169 /* 1170 * We're only interested in objects that we consider 'devices'. 1171 */ 1172 switch (type) { 1173 case ACPI_TYPE_DEVICE: 1174 type = ACPI_BUS_TYPE_DEVICE; 1175 break; 1176 case ACPI_TYPE_PROCESSOR: 1177 type = ACPI_BUS_TYPE_PROCESSOR; 1178 break; 1179 case ACPI_TYPE_THERMAL: 1180 type = ACPI_BUS_TYPE_THERMAL; 1181 break; 1182 case ACPI_TYPE_POWER: 1183 type = ACPI_BUS_TYPE_POWER; 1184 break; 1185 default: 1186 continue; 1187 } 1188 1189 if (ops->acpi_op_add) 1190 status = acpi_add_single_object(&child, parent, 1191 chandle, type); 1192 else 1193 status = acpi_bus_get_device(chandle, &child); 1194 1195 if (ACPI_FAILURE(status)) 1196 continue; 1197 1198 if (ops->acpi_op_start) { 1199 status = acpi_start_single_object(child); 1200 if (ACPI_FAILURE(status)) 1201 continue; 1202 } 1203 1204 /* 1205 * If the device is present, enabled, and functioning then 1206 * parse its scope (depth-first). Note that we need to 1207 * represent absent devices to facilitate PnP notifications 1208 * -- but only the subtree head (not all of its children, 1209 * which will be enumerated when the parent is inserted). 1210 * 1211 * TBD: Need notifications and other detection mechanisms 1212 * in place before we can fully implement this. 1213 */ 1214 if (child->status.present) { 1215 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, 1216 NULL, NULL); 1217 if (ACPI_SUCCESS(status)) { 1218 level++; 1219 phandle = chandle; 1220 chandle = NULL; 1221 parent = child; 1222 } 1223 } 1224 } 1225 1226 return 0; 1227} 1228 1229int 1230acpi_bus_add(struct acpi_device **child, 1231 struct acpi_device *parent, acpi_handle handle, int type) 1232{ 1233 int result; 1234 struct acpi_bus_ops ops; 1235 1236 1237 result = acpi_add_single_object(child, parent, handle, type); 1238 if (!result) { 1239 memset(&ops, 0, sizeof(ops)); 1240 ops.acpi_op_add = 1; 1241 result = acpi_bus_scan(*child, &ops); 1242 } 1243 return result; 1244} 1245 1246EXPORT_SYMBOL(acpi_bus_add); 1247 1248int acpi_bus_start(struct acpi_device *device) 1249{ 1250 int result; 1251 struct acpi_bus_ops ops; 1252 1253 1254 if (!device) 1255 return -EINVAL; 1256 1257 result = acpi_start_single_object(device); 1258 if (!result) { 1259 memset(&ops, 0, sizeof(ops)); 1260 ops.acpi_op_start = 1; 1261 result = acpi_bus_scan(device, &ops); 1262 } 1263 return result; 1264} 1265 1266EXPORT_SYMBOL(acpi_bus_start); 1267 1268int acpi_bus_trim(struct acpi_device *start, int rmdevice) 1269{ 1270 acpi_status status; 1271 struct acpi_device *parent, *child; 1272 acpi_handle phandle, chandle; 1273 acpi_object_type type; 1274 u32 level = 1; 1275 int err = 0; 1276 1277 parent = start; 1278 phandle = start->handle; 1279 child = chandle = NULL; 1280 1281 while ((level > 0) && parent && (!err)) { 1282 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1283 chandle, &chandle); 1284 1285 /* 1286 * If this scope is exhausted then move our way back up. 1287 */ 1288 if (ACPI_FAILURE(status)) { 1289 level--; 1290 chandle = phandle; 1291 acpi_get_parent(phandle, &phandle); 1292 child = parent; 1293 parent = parent->parent; 1294 1295 if (level == 0) 1296 err = acpi_bus_remove(child, rmdevice); 1297 else 1298 err = acpi_bus_remove(child, 1); 1299 1300 continue; 1301 } 1302 1303 status = acpi_get_type(chandle, &type); 1304 if (ACPI_FAILURE(status)) { 1305 continue; 1306 } 1307 /* 1308 * If there is a device corresponding to chandle then 1309 * parse it (depth-first). 1310 */ 1311 if (acpi_bus_get_device(chandle, &child) == 0) { 1312 level++; 1313 phandle = chandle; 1314 chandle = NULL; 1315 parent = child; 1316 } 1317 continue; 1318 } 1319 return err; 1320} 1321EXPORT_SYMBOL_GPL(acpi_bus_trim); 1322 1323 1324static int acpi_bus_scan_fixed(struct acpi_device *root) 1325{ 1326 int result = 0; 1327 struct acpi_device *device = NULL; 1328 1329 1330 if (!root) 1331 return -ENODEV; 1332 1333 /* 1334 * Enumerate all fixed-feature devices. 1335 */ 1336 if (acpi_fadt.pwr_button == 0) { 1337 result = acpi_add_single_object(&device, acpi_root, 1338 NULL, 1339 ACPI_BUS_TYPE_POWER_BUTTON); 1340 if (!result) 1341 result = acpi_start_single_object(device); 1342 } 1343 1344 if (acpi_fadt.sleep_button == 0) { 1345 result = acpi_add_single_object(&device, acpi_root, 1346 NULL, 1347 ACPI_BUS_TYPE_SLEEP_BUTTON); 1348 if (!result) 1349 result = acpi_start_single_object(device); 1350 } 1351 1352 return result; 1353} 1354 1355 1356static inline struct acpi_device * to_acpi_dev(struct device * dev) 1357{ 1358 return container_of(dev, struct acpi_device, dev); 1359} 1360 1361 1362static int root_suspend(struct acpi_device * acpi_dev, pm_message_t state) 1363{ 1364 struct acpi_device * dev, * next; 1365 int result; 1366 1367 spin_lock(&acpi_device_lock); 1368 list_for_each_entry_safe_reverse(dev, next, &acpi_device_list, g_list) { 1369 if (dev->driver && dev->driver->ops.suspend) { 1370 spin_unlock(&acpi_device_lock); 1371 result = dev->driver->ops.suspend(dev, 0); 1372 if (result) { 1373 printk(KERN_ERR PREFIX "[%s - %s] Suspend failed: %d\n", 1374 acpi_device_name(dev), 1375 acpi_device_bid(dev), result); 1376 } 1377 spin_lock(&acpi_device_lock); 1378 } 1379 } 1380 spin_unlock(&acpi_device_lock); 1381 return 0; 1382} 1383 1384 1385static int acpi_device_suspend(struct device * dev, pm_message_t state) 1386{ 1387 struct acpi_device * acpi_dev = to_acpi_dev(dev); 1388 1389 /* 1390 * For now, we should only register 1 generic device - 1391 * the ACPI root device - and from there, we walk the 1392 * tree of ACPI devices to suspend each one using the 1393 * ACPI driver methods. 1394 */ 1395 if (acpi_dev->handle == ACPI_ROOT_OBJECT) 1396 root_suspend(acpi_dev, state); 1397 return 0; 1398} 1399 1400 1401 1402static int root_resume(struct acpi_device * acpi_dev) 1403{ 1404 struct acpi_device * dev, * next; 1405 int result; 1406 1407 spin_lock(&acpi_device_lock); 1408 list_for_each_entry_safe(dev, next, &acpi_device_list, g_list) { 1409 if (dev->driver && dev->driver->ops.resume) { 1410 spin_unlock(&acpi_device_lock); 1411 result = dev->driver->ops.resume(dev, 0); 1412 if (result) { 1413 printk(KERN_ERR PREFIX "[%s - %s] resume failed: %d\n", 1414 acpi_device_name(dev), 1415 acpi_device_bid(dev), result); 1416 } 1417 spin_lock(&acpi_device_lock); 1418 } 1419 } 1420 spin_unlock(&acpi_device_lock); 1421 return 0; 1422} 1423 1424 1425static int acpi_device_resume(struct device * dev) 1426{ 1427 struct acpi_device * acpi_dev = to_acpi_dev(dev); 1428 1429 /* 1430 * For now, we should only register 1 generic device - 1431 * the ACPI root device - and from there, we walk the 1432 * tree of ACPI devices to resume each one using the 1433 * ACPI driver methods. 1434 */ 1435 if (acpi_dev->handle == ACPI_ROOT_OBJECT) 1436 root_resume(acpi_dev); 1437 return 0; 1438} 1439 1440 1441static struct bus_type acpi_bus_type = { 1442 .name = "acpi", 1443 .suspend = acpi_device_suspend, 1444 .resume = acpi_device_resume, 1445}; 1446 1447 1448 1449static int __init acpi_scan_init(void) 1450{ 1451 int result; 1452 struct acpi_bus_ops ops; 1453 1454 1455 if (acpi_disabled) 1456 return 0; 1457 1458 result = kset_register(&acpi_namespace_kset); 1459 if (result < 0) 1460 printk(KERN_ERR PREFIX "kset_register error: %d\n", result); 1461 1462 result = bus_register(&acpi_bus_type); 1463 if (result) { 1464 /* We don't want to quit even if we failed to add suspend/resume */ 1465 printk(KERN_ERR PREFIX "Could not register bus type\n"); 1466 } 1467 1468 /* 1469 * Create the root device in the bus's device tree 1470 */ 1471 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, 1472 ACPI_BUS_TYPE_SYSTEM); 1473 if (result) 1474 goto Done; 1475 1476 result = acpi_start_single_object(acpi_root); 1477 if (result) 1478 goto Done; 1479 1480 acpi_root->dev.bus = &acpi_bus_type; 1481 snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name); 1482 result = device_register(&acpi_root->dev); 1483 if (result) { 1484 /* We don't want to quit even if we failed to add suspend/resume */ 1485 printk(KERN_ERR PREFIX "Could not register device\n"); 1486 } 1487 1488 /* 1489 * Enumerate devices in the ACPI namespace. 1490 */ 1491 result = acpi_bus_scan_fixed(acpi_root); 1492 if (!result) { 1493 memset(&ops, 0, sizeof(ops)); 1494 ops.acpi_op_add = 1; 1495 ops.acpi_op_start = 1; 1496 result = acpi_bus_scan(acpi_root, &ops); 1497 } 1498 1499 if (result) 1500 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); 1501 1502 Done: 1503 return result; 1504} 1505 1506subsys_initcall(acpi_scan_init); 1507